docstr: Test `tokenize` with special tokens.
docstr_tok: ["Test","`","tokenize","`","with","special","tokens","."]
code: def test_tokenize_special_tokens(self):
      """Test `tokenize` with special tokens."""
      tokenizers = self.get_tokenizers(fast=True)
      for tokenizer in tokenizers:
          with self.subTest(f"{tokenizer.__class__.__name__}"):
              SPECIAL_TOKEN_1 = "<unk>"
              SPECIAL_TOKEN_2 = "<mask>"
  
              token_1 = tokenizer.tokenize(SPECIAL_TOKEN_1)
              token_2 = tokenizer.tokenize(SPECIAL_TOKEN_2)
  
              self.assertEqual(len(token_1), 1)
              self.assertEqual(len(token_2), 1)
              self.assertEqual(token_1[0], SPECIAL_TOKEN_1)
              self.assertEqual(token_2[0], SPECIAL_TOKEN_2)
  
file_path: H2O/h2o_flexgen/benchmark/third_party/transformers/tests/models/esm/test_tokenization_esm.py
imports: import os
  import tempfile
  import unittest
  from typing import List
  from transformers.models.esm.tokenization_esm import VOCAB_FILES_NAMES, EsmTokenizer
  from transformers.testing_utils import require_tokenizers
  from transformers.tokenization_utils import PreTrainedTokenizer
  from transformers.tokenization_utils_base import PreTrainedTokenizerBase
label_desc: Use image node_id 8 for calling the ESMTokenizationTest obj's underlying member method code with example usage: obj.test_tokenize_special_tokens() without return types